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Finding the Fourth Proportional to 45,879.81, 68,838.09 and 20,931.61

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Solution

The fourth proportional to 45,879.81, 68,838.09 and 20,931.61 is: 31,405.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,879.81 : 68,838.09 = 20,931.61 : x
  2. Step 2: Convert to fraction form
    45,879.81/68,838.09 = 20,931.61/x
  3. Step 3: Cross multiply
    45,879.81x = 68,838.09 × 20,931.61
  4. Step 4: Simplify right side
    45,879.81x = 1,440,892,053.02
  5. Step 5: Solve for x
    x = 1,440,892,053.02/45,879.81
  6. Step 6: Final answer
    x = 31,405.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.